My favorite character is rather shy and appears timid. Yet under that fearful, even silly, exterior is a great love and respect for the one he cares for the most. He wants to be like the one he cares for the most. And he's rather cute. It's too bad that most people can't remember his name, though--even though he's done just as much as the hero of the Mushroom Kingdom.
It should be obvious. ;)
Spoiler Below 'tis Luigi~